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You can use the concept of map reduce to get the position in an array. Let us first create a collection with documents −> db.retrievePositionDemo.find(); { "_id" : ObjectId("5cd569ec7924bb85b3f4893f"), "Subjects" : [ "MySQL", "MongoDB", "Java" ] }Following is the query to display all documents from a collection with the help of find() method −> db.retrievePositionDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd569ec7924bb85b3f4893f"), "Subjects" : [ "MySQL", "MongoDB", "Java" ] }Following is the query to retrieve the position in an array in MongoDB ... Read More
To create a borderless window in Java, do not decorate the window. The following is an example to create a BorderLess Window −Examplepackage my; import java.awt.GraphicsEnvironment; import java.awt.GridLayout; import java.awt.Point; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.JWindow; import javax.swing.SwingConstants; public class SwingDemo { public static void main(String[] args) throws Exception { JWindow frame = new JWindow(); JLabel label1, label2, label3; frame.setLayout(new GridLayout(2, 2)); label1 = new JLabel("Id", SwingConstants.CENTER); label2 = new JLabel("Age", SwingConstants.CENTER); label3 = new JLabel("Password", SwingConstants.CENTER); ... Read More
The tag defines the heading of an HTML document. It is used to group the - headings.Note − The tag introduced and deprecated in HTML5. It is dropped from W3C HTML5 specification.Following is the syntax − Let us now see an example to implement the element in HTML −Example Live Demo Document Title Demo Heading One Demo Heading Two This is demo text. This is demo text. This is demo text. This is demo text. OutputIn the above example, we have set the two headings the − Demo Heading One Demo Heading Two
Whenever, you extend a class a copy of superclass’s members is available to the subclass object and, when you can call the method of the superclass using the object of the subclass.ExampleIn the following example, we have a class named SuperClass with a method with name demo(). We are extending this class with another class (SubClass).Now, you create an object of the subclass and call the method demo(). Live Democlass SuperClass{ public void demo() { System.out.println("demo method"); } } public class SubClass extends SuperClass { public ... Read More
The HTML DOM Input Email disabled property sets/returns whether Input Email is enabled or disabled.SyntaxFollowing is the syntax −Returning boolean value - true/falseinputEmailObject.disabledSetting disabled to booleanValueinputEmailObject.disabled = booleanValueBoolean ValuesHere, “booleanValue” can be the following −booleanValueDetailstrueIt defines that the input email is disabled.falseIt defines that the input email is not disabled and it is also the default value.ExampleLet us see an example of Input Email disabled property − Live Demo Input Email disabled form { width:70%; margin: 0 auto; text-align: center; } * { padding: ... Read More
It will display the missing values from the given set entered by the userGiven : array = {88, 105, 3, 2, 200, 0, 10}; Output : 1 4-9 11-87 89-99AlgorithmSTART STEP 1-> Take an array with elements, bool flag[MAX] to Fale, int i, j, n to size of array Step 2-> Loop For from I to 0 and i=0 Set flag[array[i]]=true End IF Step 3 -> End For Loop Step 4 -> Loop For from i to 0 and i=0) { flag[array[i]] = true; //Making the value of the elements present in ... Read More
Let us first create a collection with documents −> db.incrementDemo.insertOne({"Value1":10, "Value2":20}); { "acknowledged" : true, "insertedId" : ObjectId("5cbdaf07de8cc557214c0e15") }Display all documents from a collection with the help of find() method. The query is as follows −> db.incrementDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cbdaf07de8cc557214c0e15"), "Value1" : 10, "Value2" : 20 }Following is the query to increment two fields in one command in MongoDB −> db.incrementDemo.update({}, { $inc : { Value1 : 1, Value2 : 1 } }); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check both the fields ... Read More
The getColumnTypeName() method of the ResultSetMetaData (interface) retrieves and returns the name of the datatype of the specified column in the current ResultSet object.This method accepts an integer value representing the index of a column and, returns a String value representing the name of the SQL data type of the specified column.To get the ResultSetMetaData object, you need to −Register the Driver: Select the required database register the Driver class of the particular database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get connection: Create a connection object by passing the URL ... Read More
To remove key fields in MongoFB, you can use $unset operator. Let us first create a collection with documents −>db.removeKeyFieldsDemo.insertOne({"StudentFirstName":"John", "StudentLastName":"Doe", "StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cc6c8289cb58ca2b005e672") } >db.removeKeyFieldsDemo.insertOne({"StudentFirstName":"John", "StudentLastName":"Smith", "StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5cc6c8359cb58ca2b005e673") }Following is the query to display all documents from a collection with the help of find() method −> db.removeKeyFieldsDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cc6c8289cb58ca2b005e672"), "StudentFirstName" : "John", "StudentLastName" : "Doe", "StudentAge" : 23 } { "_id" : ObjectId("5cc6c8359cb58ca2b005e673"), "StudentFirstName" : "John", "StudentLastName" : "Smith", ... Read More
For vertical alignment, create a frame and set the layout using the BoxLayout manager −JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.Y_AXIS));Above, we have set the BoxLayout to set the alignment since it is a layout manager that allows multiple components to be laid out either vertically or horizontally. We have set vertical alignment here −BoxLayout.X_AXISThe following is an example to set vertical alignment for a component −Examplepackage my; import java.awt.Component; import java.awt.Dimension; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo { public static void main(String[] args) { JFrame frame ... Read More